debian

ansible-playbook dist-upgrade.yml -i your_inventory [-l host_name]

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Installation
apt install -y bridge-utils debootstrap lxc-templates lxc
http://www.panticz.de/install_lxc

Create container
export LANG=en_US.UTF-8
export CONTAINER=wheezy

sudo sudo lxc-destroy -n ${CONTAINER}
sudo lxc-create -t debian -n ${CONTAINER}
sudo lxc-start -d -n ${CONTAINER}

echo 'Acquire::http::Proxy "http://apt-cacher:3142/";' | sudo tee /var/lib/lxc/${CONTAINER}/rootfs/etc/apt/apt.conf

sudo lxc-attach -n ${CONTAINER} -- apt-get clean
sudo lxc-attach -n ${CONTAINER} -- apt-get update

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$URL="https://raw.githubusercontent.com/panticz/installit/master/install.xen.sh";
echo "wget -q --no-check-certificate $URL -O - | bash -";
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Enable XL toolstacks
sed -i 's|TOOLSTACK=|TOOLSTACK=xl|g' /etc/default/xen

configure perfomance
http://wiki.xen.org/wiki/Credit_Scheduler
xm sched-credit
xm sched-credit -d www -w 512

# OPTIONAL: sync time
apt-get install -y ntpdate
ntpdate ntp.ubuntu.com
hwclock --systohc
rm /etc/cron.daily/ntpdate

# updae bootstrap
http://www.panticz.de/update_debootstrap

# manually update xen-create-image
wget http://ftp.de.debian.org/debian/pool/main/x/xen-tools/xen-tools_4.3.1-1_all.deb -O /tmp/xen-tools_4.3.1-1_all.deb
dpkg -x /tmp/xen-tools_4.3.1-1_all.deb /tmp/
mv /usr/bin/xen-create-image /usr/bin/xen-create-image.org
cp /tmp/usr/bin/xen-create-image /usr/bin/xen-create-image

# OPTIONAL: enable ip forward in dom0
cp /etc/sysctl.conf /etc/sysctl.conf.org
sed -i 's|#net.ipv4.ip_forward=1|net.ipv4.ip_forward=1|g' /etc/sysctl.conf

# OPTIONAL: PCI delegation
http://www.panticz.de/xen_pci_delegation

# reboot
reboot

# Ubuntu Xen Dom0
apt-get install -y xen-hypervisor-4.2-amd64 xen-tools

# LINKS
http://wiki.debian.org/Xen
http://wiki.xensource.com/xenwiki/XenBestPractices
http://www.panticz.de/configure_network_bridge
http://www.panticz.de/update_debootstrap
http://www.chrisk.de/blog/2008/12/how-to-run-xen-in-ubuntu-intrepid-without-compiling-a-kernel-by-yourself/
http://wiki.debian.org/Xen
https://help.ubuntu.com/community/Xen

# run update
export DEBIAN_FRONTEND=noninteractive
LANG=en_US.UTF-8 sudo apt-get update -y && sudo apt-get dist-upgrade -y && sudo apt-get autoremove -y && sudo apt-get clean -y

# allow unauthenticated repository
apt-get update --allow-unauthenticated

# list updatable packages
apt list --upgradable

# view avaiable package version
apt-cache show wget
apt-cache madison wget

# install specific version
apt-get install package name=version
apt-get install wget=1.6

# install from specific repository
apt-get install -t squeeze-backports wget

# view available versions